GeForce 8500 GT vs Radeon HD 6770

Intro

Compare all that to the Radeon HD 6770, which features a core clock frequency of 900 MHz and a GDDR5 memory speed of 1050 MHz. It also makes use of a 128-bit memory bus, and uses a 40 nm design. It is comprised of 800 SPUs, 40 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8500 GT		45 Watts
Radeon HD 6770		108 Watts
	Difference: 63 Watts (140%)

Memory Bandwidth

Performance-wise, the Radeon HD 6770 should theoretically be much superior to the GeForce 8500 GT in general. (explain)

Radeon HD 6770		67200 MB/sec
GeForce 8500 GT		12800 MB/sec
	Difference: 54400 (425%)

Texel Rate

The Radeon HD 6770 is much (more or less 900%) better at anisotropic filtering than the GeForce 8500 GT. (explain)

Radeon HD 6770		36000 Mtexels/sec
GeForce 8500 GT		3600 Mtexels/sec
	Difference: 32400 (900%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 6770 is superior to the GeForce 8500 GT, by a large margin. (explain)

Radeon HD 6770		14400 Mpixels/sec
GeForce 8500 GT		1800 Mpixels/sec
	Difference: 12600 (700%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

Specifications

Memory Bandwidth: Memory bandwidth is the largest amount of information (in units of megabytes per second) that can be transferred past the external memory interface in a second. It's worked out by multiplying the bus width by its memory clock speed. In the case of DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This is worked out by multiplying the total number of texture units of the card by the core clock speed of the chip. The better this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.